Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Original Publisher | First Appearance | Year | Date |
| --- | --- | --- | --- | --- |
| X' Hal | DC Comics | The New Teen Titans , Vol. 1, #24 | 1982.0 | October |
| X-21 | DC Comics | Action Comics , Vol. 1, #333 | 1966.0 | February |
| X-24 | DC Comics | The New Titans , Vol. 1, #73 | 1991.0 | February |
| X-2-Y | DC Comics | Action Comics , Vol. 1, #344 | 1966.0 | December |
| X-5 Super Agent | Quality Comics | Hit Comics , Vol. 1, #1 | 1940.0 | July |
| X | Quality Comics | Military Comics , Vol. 1, #1 | 1942.0 | March |
| Xadu, Doctor | DC Comics | Adventure Comics , Vol. 1, #283 | 1961.0 | April |
| Xanna | Gorilla Comics / DC Comics | Empire , Vol. 1, #1 | 2000.0 | May |
| Xanthi | DC Comics | New Titans , Vol. 1, #51 | 1989.0 | January |
| Xardo | DC Comics | Action Comics , Vol. 1, #325 | 1965.0 | June |
| Xasnu | DC Comics | Action Comics , Vol. 1, #278 | 1961.0 | July |
| Xavier, Charles | DC Comics / Marvel Comics | DC Versus Marvel Comics , Vol. 1, #3 | 1996.0 | February |
| Xax (I) | DC Comics | Green Lantern , Vol. 2, #9 | 1961.0 | December |
| Xax (II) | DC Comics | 52 , Vol. 1, #31 | 2006.0 | December |
| X-Bomb Betty | DC Comics | Legionnaires , Vol. 1, #2 | 1993.0 | May |
| Xebel | DC Comics | Aquaman , Vol. 1, #11 | 1963.0 | September |
| Xeen Arrow | DC Comics | Adventure Comics , Vol. 1, #253 | 1958.0 | October |
| Xenofobe | DC Comics | Superman , Vol. 1 #295 | 1976.0 | January |
| Xeo | DC Comics | Detective Comics , Vol. 1. #260 | 1958.0 | October |
| Xera | DC Comics | Legion of Super-Heroes , Vol. 3, #32 | 1987.0 | March |
| Xero | DC Comics | Xero, Vol. 1, #1 | 1997.0 | May |
| Xiang-Fa | DC Comics | Green Lantern , Vol. 3, #19 | 1991.0 | December |
| Xiuhtecutli | DC Comics | Justice League International , Vol. 2, #63 | 1994.0 | April |
| XL Terrestrial | Warner Bros. Animation | Teen Titans (TV series) | 2004.0 | August 28 |
| Xola Aq | DC Comics | Adventure Comics , Vol. 1, #350 | 1966.0 | November |
| Xolotl | DC Comics | 52 , Vol. 1, #21 | 2006.0 | September |
| Xombi | Milestone Media | Xombi , Vol. 1, #0 | 1994.0 | January |
| Xotar | DC Comics | Brave and the Bold , Vol. 1, #29 | 1960.0 | May |
| Xov | DC Comics | Action Comics , #242 | 1958.0 | July |
| XS | DC Comics | Legionnaires , Vol. 1, #0 | 1994.0 | October |
| Xylpth | DC Comics | Green Lantern , Vol. 2, #151 | 1982.0 | April |
Question:
What first appeared in 1966 in the comic X-2-Y?
Answer:
Action Comics , Vol. 1, #344