Dan Blocker (1928-1972) was an actor best known for playing Eric "Hoss" Cartwright on the TV show Bonanza, from 1959 until his death. In 1970, for Sesame Street Season 2, Blocker appeared in several inserts with Bonanza co-stars Lorne Greene and Michael Landon.
- Counting to twenty (EKA: Episode 0131)
- Saying the alphabet (EKA: Episode 0171)
- Subtracting horses (EKA: Episode 0170)
- Adding horses (EKA: Episode 0303)
- Demonstrating near and far (EKA: Episode 0349)