Lyja is a fictional character appearing in American comic books published by Marvel Comics. A Skrull, she possesses the ability to shapeshift into almost any humanoid or animal form. Modifications on her body give her the power to generate energy blasts.

Lyja the Laserfist first appeared in Fantastic Four #357 (Oct. 1991), and was created by Tom DeFalco and Paul Ryan. She was revealed to have been impersonating Alicia Masters ever since Fantastic Four #265 (April 1984). Lyja remained a supporting character in the series until the launch of the "Heroes Reborn" storyline in 1996. She returned in a tie-in to the Secret Invasion limited series in 2008.

The Skrull Empire—longtime enemies of the Fantastic Four—embarked on a plan to infiltrate the team by impersonating Alicia Masters. The author of the plan, Paibok, selected the warrior Lyja to be the spy and espionage agent—possibly as retribution because they had once had a failed affair. Nevertheless, Lyja trained extensively to pull off the disguise, even using contact lenses to make herself blind in human form to learn how to navigate the world as Alicia did.

Soon after Lyja's arrival on Earth, a near-omnipotent being known as the Beyonder kidnapped numerous super-powered beings (including three members of the Fantastic Four), transporting them to a makeshift Battleworld, where they participated in a series of "Secret Wars" between the so-called forces of good and evil. Lyja took the opportunity of their distraction to replace Alicia, greeting the Fantastic Four on their return to Earth from Battleworld. The Skrull plan almost hit a snag when Lyja discovered that the Thing opted to remain on Battleworld at the end of the war, instead of returning home to Earth. Lyja instead seduced Johnny Storm, the Human Torch. When the Thing learned that Johnny and "Alicia" were lovers, they became estranged. Lyja fell in love with Johnny and eventually they were married under the false pretense of her as Alicia Masters.

Eventually Alicia's stepfather, the Puppet Master, realized that Alicia was an imposter, and took his suspicions to the Thing, who exposed her. She disclosed her true identity, as well as the fact that the Skrulls had imprisoned the real Alicia. She aided the Fantastic Four in finding the real Alicia Masters in the Skrull Empire, but was believed to be slain when she threw herself in the path of a blast which Paibok had meant for the Human Torch.

In actuality, Paibok recovered Lyja and revealed to Devos the Devastator that she was still alive. Paibok, with the assistance of Devos, awoke Lyja from her comatose state, and bestowed her with the power to fly and fire energy blasts from her hands becoming "Lyja the Lazerfist". These powers were later revealed to come from a special device implanted into her. Joining them in search of vengeance, the three arrived on Earth, and isolated and battled the Torch at Empire State University. Panicking, the Torch burst into his Nova Flame and destroyed the campus. Alongside Devos and Paibok, Lyja witnessed a battle between the Fantastic Four and an alternate Fantastic Four. Lyja still bore feelings for the Torch and once again betrayed her cohorts to side with the Four.

Lyja then first encountered Aron the Watcher, and aided the Fantastic Four against Doctor Doom. Alongside the Fantastic Four, Lyja battled Devos, Paibok, Klaw, and Huntara. Lyja impersonated Bridget O'Neil, and became jealous on discovering Johnny Storm's affection for Bridget.

After returning to the Fantastic Four and Johnny, Lyja claimed she was pregnant with Johnny's child. Over time, Lyja and Johnny began to grow close again. When Lyja delivered the "child" (an egg), the implant that gave her the "Lazerfist" powers was also removed, returning Lyja to an ordinary Skrull with no extra powers beyond her shapeshifting. The implant was subsequently absorbed by a normal human, apparently an electronics expert named Raphael Suarez, who gained the "Lazerfist" powers, and attempted to contact the Fantastic Four for their assistance but after the hectic events that followed the hatching of the "egg", Raphael wandered off, realizing the Fantastic Four were not going to be of any help in their current state, and has not been referenced since.