Axel Tischer (born 5 November 1986) is a German professional wrestler currently performing for German Wrestling Federation (GWF), Westside Xtreme Wrestling (wXw) and Progress Wrestling, where he is the former Progress Wrestling Atlas Champion and one-time holder of the Progress World Tag Team Champions. He is best known for his tenure in WWE, where he performed under the ring name, Alexander Wolfe.

Under his real name, Tischer competed on the European independent circuit. During this period, he is best known in Westside Xtreme Wrestling, where he is a two-time Unified World Wrestling Champion and two-time Shotgun Champion. He is also the former GWF World Champion in his first time. He then debuted in WWE's NXT brand as part of the stable Sanity, where he and Eric Young won the NXT Tag Team Championship in 2017. After moving to the SmackDown brand in 2018, the group saw little success, resulting in their disbandment in early 2019. He subsequently began wrestling in the NXT and NXT UK brands as part of the Imperium stable until his WWE departure in 2021.

Tischer began training to be a professional wrestler at age 13 in his home town of Dresden. Tischer wrestled extensively on the independent circuit throughout Germany and Europe, appearing for numerous promotions including German Stampede Wrestling, the German Wrestling Federation and Westside Xtreme Wrestling. In 2012 he defeated El Generico to win the wXw Unified World Wrestling Championship and held the championship for almost a year before losing it to Tommy End.

In April 2015, Tischer began training at the WWE Performance Center as part of a class of 10 international WWE recruits. He made his television debut on 15 July 2015 episode of NXT, losing to Samoa Joe. In August, Tischer adopted the ring name Alexander Wolfe.

In 2016, Wolfe formed a tag-team with Sawyer Fulton at NXT live events. In September, Wolfe and Sawyer joined a stable called Sanity, which also included Eric Young and Nikki Cross. The stable made its debut on the 12 October episode of NXT, with Wolfe and Fulton defeating the team of Bobby Roode and Tye Dillinger as part of the Dusty Rhodes Tag Team Classic. On the 2 November episode of NXT, in the second round of the tournament, Wolfe and Fulton defeated the team of T. J. Perkins and Kota Ibushi. Wolfe and Fulton lost to TM-61 in the semi-finals of the tournament. On 19 August 2017, at NXT TakeOver: Brooklyn III, Wolfe and Eric Young defeated The Authors of Pain to win the NXT Tag Team Championship, becoming the first German to hold a championship in WWE. Young and Killian Dain lost the Tag Team Championship to The Undisputed Era (Bobby Fish and Kyle O'Reilly) on the 20 December episode of NXT.

During the 2018 WWE Superstar Shake-up, SAnitY (excluding Cross) were drafted to SmackDown. The group debuted on the 19 June episode of SmackDown LIVE where they attacked The Usos. The following week, SAnitY lost to The Usos and Jeff Hardy. On the 3 July episode of SmackDown LIVE, the group attacked The New Day. This led to a tables match between the two teams at Extreme Rules, which SAnitY won. On the 24 July episode of SmackDown LIVE, SAnitY and The New Day faced off in the first round of the WWE SmackDown Tag Team Championship No. 1 Contender's tournament. SAnitY (represented by Wolfe and Dain) were defeated.

The group competed in only two more televised matches throughout the remainder of 2018, while primarily competing at live events. After a near four-month hiatus from television, SAnitY returned on the 2 April 2019 episode of SmackDown LIVE, losing a three-on-one Falls Count Anywhere match to The Miz. During the 2019 WWE Superstar Shake-up, Young was drafted to Raw.

Following the disbanding of Sanity, Wolfe made his debut appearance for the NXT UK brand on the 12 June episode of NXT UK, joining the brand and aligning himself with Imperium alongside Walter, Fabian Aichner, and Marcel Barthel. On 3 the July episode of NXT UK, Wolfe made his in-ring debut for the brand, defeating Jack Starz. Wolfe, along with Imperium, appeared on the 11 November episode of Raw, accompanying and interfering during Walter's match against the WWE Universal Champion Seth Rollins, until Kevin Owens and The Street Profits made the save, this led to an eight-man tag team match, were Imperium were defeated after Rollins pinned Wolfe.