The Dumbbelltron is a that Marcus created with the "work out" Metavirus to draw attention to tire out the Lab Rats. This Viratron flings heavy dumbbells at people that latches to their hands & makes them follow his commands. Since he is made from exercise equipment, he's a rather boisterous being that wants people to work out, or otherwise be killed for not keeping up. Dumbbelltron praised Adam, for his fight brought him victory.