Dr. H.G. Groves was a Weyland-Yutani employee and Karl Bishop Weyland's top scientist on BG-386, and as such was in charge of the Xenomorphs bred for study there. He is arguably the main antagonist in the Alien campaign in the 2010 video game Aliens vs. Predator (although the player never directly fights him).
During the harvest procedure, one of the Xenomorph specimen known as Specimen 6 escaped after emerging from its host's mouth, he then gassed the room which killed the two researchers and neutralized Specimen 6, but Weyland insisted on keeping it alive and putting it in the program.
As Six grew into a mature Warrior, Groves trained it to become a perfect killing machine. After the training, Specimen Six attempted to escape but Groves ordered it to be gassed and restrained. During the power failure, Six escaped from its restrain and Groves escaped, locking his fellow researcher inside with Six. Six manage to escape as Groves witness it and several other Xenomorphs kill everyone in their path and free the Queen.
With the entire compound infested, Groves attempted to escape the planet, but he and a few combat androids discover Six, and on Weyland's request, captured it. They take the captured Specimen Six off-world to an orbiting ship, where Six grew into a Praetorian and killed the crew, kidnapping Groves and escaped. While Groves is hived to the wall, he watches Six transforming into a new Queen.
His fate remains unknown, although it is likely he was implanted with a chestburster and died.
Groves is shown to have no feelings for his subordinates, such as locking a fellow scientist in a room to be killed by Six when there was a power failure and using his own staff as test subjects for Six's training. He is also shown to have some fascination on Xenomorphs, especially Specimen 6. Also, he seems to show negative emotions towards Weyland's Combat Androids, commenting on how the androids outrank most of his staff, he thought that they will eventually be giving him, orders. This text is discovered from various recordings discovered by the Rookie.