Niels
Speedball's cat
- Also known as Hairball
Appearances
- Speedball #1 — 1988-09-00
- Speedball #2 — 1988-10-00
- Speedball #3 — 1988-11-00
- Speedball #4 — 1988-12-00
- Speedball #5 — 1989-01-00
- Speedball #6 — 1989-02-00
- Speedball #7 — 1989-03-00
- Speedball #10 — 1989-06-00
- Damage Control #3 — 1990-01-00
- The New Warriors Annual #1 — 1991-07-00
- The New Warriors: Beginnings #[nn] — 1992-06-02
- Lockjaw and the Pet Avengers #[nn] — 2009-10-21
- Avengers: The Initiative #29 — 2009-12-00
- Lockjaw and the Pet Avengers #[nn] — 2010-00-00
- Lockjaw & the Pet Avengers: Unleashed #[nn] — 2010-09-15
- Lockjaw & the Pet Avengers: Unleashed #[nn] — 2010-13-00
- Avengers vs. the Pet Avengers #[nn] — 2011-06-22
- Deadpool #27 — 2014-06-00
- Guardians Team-Up #5 — 2015-07-00
- Marvel Visionaries: Steve Ditko #[nn] — 2019-10-16