4) Lou Ferrigno
Lou Ferrigno is a true giant of Marvel history, having played the Green Goliath himself in the hit 1980s TV series The Incredible Hulk. As thanks for his inextricable link to the character, he’s lent his voice for every appearance of the Hulk in the Marvel Cinematic Universe.
However, he has also appeared in the flesh, as well. Ferrigno has a decently-sized cameo as a security guard at Culver University. Unfortunately, he isn’t too great at his job, as Bruce Banner is able to get past him by bribing him with some pizza.
This cameo is particularly fun as it references Ferrigno’s previous role in 2003’s Hulk, where he also played a security guard. That time, he starred opposite Stan Lee. Pairing the widely different duo up made for a nicely comic scene.